Description
The Bear’s Para ISO, designed by the renowned fly tyer Tim Bear, is a highly effective imitation of the Iso (Isohyphes) mayfly nymph, commonly found in coldwater rivers. Developed for selective trout in streams where Iso hatches are prevalent, this fly uses the para-wing design to create an easy-to-see, high-floating pattern while maintaining a natural silhouette in the water. Its carefully selected materials and profile allow it to float with precision, even during heavy hatches, making it a go-to choice for anglers targeting mayfly-feeding trout in late spring to early summer. The Para ISO is known for its versatility, able to imitate the emergence of both nymphs and duns effectively.
Pro Tip
Post-Hatch Targeting: After the main hatch has occurred, target fish that are feeding on spent or drifting Iso duns. Use an extended drift with the Para ISO to mimic the spent adult drifting downstream, drawing strikes from fish that are still keyed in on the hatch but becoming more selective.
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Recipe
Hook: Tiemco TMC 102Y or equivalent, size 14-18 Thread: Olive 8/0 or 70 Denier Tail: Olive or light brown hackle fibers Body: Olive dubbing with a slight touch of tan for a natural nymph-like appearance Wing: Para-wing of polypro or comparable synthetic material Hackle: Brown or grizzly dry fly hackle, tied sparsely Thorax: Olive dubbing or a darker shade to match the nymph's thoracic region